(Synthetic detergents) is with the scientific progress, the people's life needs of a variety of washing machine development and development of the product, it is prepared by the surfactant and a variety of additives, mainly for the washing of the fabric, the human body Clean care, hard surface cleaning.
The decontamination mechanism of the detergent is illustrated by the washing of the clothes. Contamination of clothing is often a mixture of liquid and solid, in physical - chemical, or even mechanical effects adsorbed on the surface of the fabric fibers or into the fiber between the organization, both damage to the appearance of clothing, but also damage the clothing Organization and shorten its service life. Detergent cleaning process, can be simply expressed as:
Fabric, dirt + detergent → fabric + dirt and detergent
(Dirty clothes) (dirty washing liquid)
The mechanism of the decontamination process is more complex, including the following physical - chemical effects:
1, wetting effect: the surfactant in the washing solution can reduce the surface tension of water, thereby increasing the wetting ability of the water to the fabric, so that the full penetration of the washing fluid between the fibers, surfactant molecules and the fabric was washed On the dirt to produce affinity, so that the dirt from the fabric separation.
2, the adsorption effect: between the water and washed fabric, between the water and dirt, there is the interface, the active ingredients in the washing liquid by the fabric and dirt adsorption, the interface and the fabric to change the electrostatic attraction of dirt, So that the dirt in the water was suspended or reported state.
3, solubilization effect: dirt was wrapped in the detergent layer between the glue, resulting in solubilization phenomenon.
4, the role of mechanical: When the dirt and fabric adsorption surfactant, in the artificial scrubbing or mechanical action, the dirt separated from the fabric and dispersed in the solution, after repeated rinsing, dirt can be removed.
Many types of synthetic detergent, according to product forms are divided into powder, paste, tablets, liquids and so on.
The same time as
Production process Various types of synthetic detergents have different production processes to wash powder is the most complex. Spray drying and post-batching process is the most common, the main process for the slurry preparation, spray drying, air to send aging and after the ingredients.
The preparation of the slurry is the surfactant and various additives according to the formula in the mixing pot mixing, after filtration to remove large debris, and then into the high-speed rotation of the grinding mill into the slurry. The preparation method of the slurry is intermittent and continuous.
Spray drying is the main process for the manufacture of granular detergents. The slurry is pumped from the high pressure pump to the top of the spray tower and sprayed through the nozzle in the spray gun. Hot air from the tower into the tower, was rotating state to the top. The two countercurrent encounter, the slurry droplets by preheating, surface evaporation, internal diffusion and other processes to be heated and dried. The bottom of the product through the screening, separation of bulk materials (commonly known as the first powder). The top of the tower with the cyclone separator to recover fine powder, and finally through the exhaust fan into the atmosphere. Spray drying method of production of products, production, quality is relatively stable. But the need for more equipment, investment is greater, more heat.
The product from the bottom of the tower temperature is higher (generally about 60-80 º C), through the belt conveyor and the wind to send the process of cooling and aging, and then into the sedimentation separator, separation of fine powder. And then perfumed in the post-batching equipment, adding enzymes and adding other small amount of surfactant.
Some small-volume detergent powders are agglomerated in the form of a mixture of powdered auxiliaries having high adsorption properties in which the slurry or liquid material is injected into the mixture, or by spraying the surfactant and the auxiliary agent Strong mixing mixer molding.
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Contact: Yi Fei